Hi,

I'm a total newbie in Python, but did give quite a try to the
documentation before coming here.
Sorry if I missed the obvious.

The Tutorial says about the "for line in f" idiom that it is "space-
efficient".
Short of further explanation, I interpret this as "doesn't read the
whole file before spitting out lines".
In other words, I would say "lazy". Which would be a Good Thing, a
much nicer idiom than the usual while loop calling readline()...

But when I use it on the standard input, be it the tty or a pipe, it
seems to wait for EOF before yielding the first line.

So, is it lazy or not ? Is there some external condition that may
trigger one behavior or the other ? If not, why is it said "space
efficient" ?

TIA,

-Alex

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